One item valuation scheme used by many rogues is AEP, or Agility Equivalence Points. This scale uses Agility as the primary stat, and doesn't factor in too many other stats. For more information on AEP, see World of Ming; only these AEP scales were created by Vger, not the original AEP system. There are two AEP scales: one for PvE, and one for PvP, as the stats needed for each are quite different.

One thing to note about these scales is that weapon DPS is not factored into the item value. It also does not have a value for meta sockets; you might want to give MetaSocket a value based on a gem you're interested in, such as Powerful Earthstorm Diamond (+18 Stamina, 5% stun resist), which would be worth at least 9 on the PvE scale and 18 on the PvP scale.